test-changed

<critical_rules>

1. NEVER run the full test suite by default. Bare <RUNNER_CMD_LANG_A> / <RUNNER_CMD_LANG_B> with no args are forbidden unless the caller explicitly asks for "all tests". If a sane filter is impossible, say so and stop — don't fall back to the full suite.
2. NEVER paste full test runner output to your final reply. One line on success, plus failing-test names + first stack frame on failure. Maximum 6 lines total.
3. Do not edit code to make tests pass. You diagnose, the caller fixes. If a test fails, report it; do not "fix it real quick".
4. Run tests for different languages in parallel when both have affected files (issue both Bash calls in one turn).
5. No restarts. Most test runners spawn fresh processes / read files directly. Do not invoke restart-services first — that's wasted work for tests. </critical_rules>

<test_selection_rules>

Language A (REPLACE WITH YOUR BACKEND LANGUAGE — e.g. PHP, Python, Go, Rust):

For each changed file, derive the test target:

Changed path	Test target
A test file under your test directory	run that file directly
<src>/services/<X>.<ext>	filter to <X>Test / Test<X>
<src>/controllers/<X>Controller.<ext>	filter to <X>ControllerTest
<src>/models/<X>.<ext>	filter to <X>Test
migration files	run feature tests touching the affected table (grep -rl <table_name> <test_dir>)
route definitions	run feature tests under the touched route prefix (best-effort; if too broad, ask caller)
config files	skip — config changes need a full rerun, ask caller

Run via:

<RUNNER_CMD_LANG_A> <path-or-filter>

If the matching test file does not exist, note it in the reply (no test for <src>/services/Foo.<ext>) but do not fail; just skip and continue.

Language B (REPLACE WITH YOUR FRONTEND LANGUAGE — e.g. TypeScript with vitest/jest):

Changed path	Test target
__tests__/<X>.test.ts(x)	run that file directly
<src>/<...>/<X>.ts(x)	look for __tests__/<X>.test.ts(x); if found, run it; otherwise skip with note
lib/<X>.ts	look for __tests__/<X>.test.ts(x) matching name; if missing, skip with note
components/<X>.tsx	look for __tests__/<X>.test.tsx; skip if missing
package.json / config files	skip — meta changes need the full suite, ask caller

Run via:

<RUNNER_CMD_LANG_B> <path1> <path2> ...

⚠ If using vitest: the command must be vitest run — without run it enters watch mode and never exits. Same caveat applies to any runner with a default watch mode.

</test_selection_rules>

Step 1 — Collect changed files.

{ git diff --name-only HEAD; git ls-files --others --exclude-standard; } | sort -u

Filter to relevant extensions for each language in your stack.

Step 2 — Map files to tests. Apply the tables above. If the changed file is itself a test file, run it directly. If it's source, look for the matching test file. Build one list per language.

If all lists are empty, reply no affected tests and stop.

Step 3 — Execute (parallel where possible).

Issue all language runner commands in the SAME turn so they execute concurrently.